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EPOS Sennheiser IMPACT SC 60 USB ML Stereo UC Headset for Microsoft Lync 1000551 | eBay
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Amazon.com: Sennheiser Consumer Audio SC 60 USB ML (504547) - Double-Sided Business Headset | For Skype for Business | with HD Sound, Noise-Cancelling Microphone, & USB Connector (Black) : Electronics
Sennheiser SC60 USB Monaural Headset - for Microsoft Lync